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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2007 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.google.common.collect;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import com.google.common.collect.MapConstraints.ConstrainedMap;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import com.google.common.primitives.Primitives;<a name="line.20"></a>
<span class="sourceLineNo">021</span><a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.util.HashMap;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.util.Map;<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span>/**<a name="line.25"></a>
<span class="sourceLineNo">026</span> * A mutable class-to-instance map backed by an arbitrary user-provided map.<a name="line.26"></a>
<span class="sourceLineNo">027</span> * See also {@link ImmutableClassToInstanceMap}.<a name="line.27"></a>
<span class="sourceLineNo">028</span> * <a name="line.28"></a>
<span class="sourceLineNo">029</span> * &lt;p&gt;See the Guava User Guide article on &lt;a href=<a name="line.29"></a>
<span class="sourceLineNo">030</span> * "http://code.google.com/p/guava-libraries/wiki/NewCollectionTypesExplained#ClassToInstanceMap"&gt;<a name="line.30"></a>
<span class="sourceLineNo">031</span> * {@code ClassToInstanceMap}&lt;/a&gt;.<a name="line.31"></a>
<span class="sourceLineNo">032</span> *<a name="line.32"></a>
<span class="sourceLineNo">033</span> * @author Kevin Bourrillion<a name="line.33"></a>
<span class="sourceLineNo">034</span> * @since 2.0 (imported from Google Collections Library)<a name="line.34"></a>
<span class="sourceLineNo">035</span> */<a name="line.35"></a>
<span class="sourceLineNo">036</span>public final class MutableClassToInstanceMap&lt;B&gt;<a name="line.36"></a>
<span class="sourceLineNo">037</span>    extends ConstrainedMap&lt;Class&lt;? extends B&gt;, B&gt;<a name="line.37"></a>
<span class="sourceLineNo">038</span>    implements ClassToInstanceMap&lt;B&gt; {<a name="line.38"></a>
<span class="sourceLineNo">039</span><a name="line.39"></a>
<span class="sourceLineNo">040</span>  /**<a name="line.40"></a>
<span class="sourceLineNo">041</span>   * Returns a new {@code MutableClassToInstanceMap} instance backed by a {@link<a name="line.41"></a>
<span class="sourceLineNo">042</span>   * HashMap} using the default initial capacity and load factor.<a name="line.42"></a>
<span class="sourceLineNo">043</span>   */<a name="line.43"></a>
<span class="sourceLineNo">044</span>  public static &lt;B&gt; MutableClassToInstanceMap&lt;B&gt; create() {<a name="line.44"></a>
<span class="sourceLineNo">045</span>    return new MutableClassToInstanceMap&lt;B&gt;(<a name="line.45"></a>
<span class="sourceLineNo">046</span>        new HashMap&lt;Class&lt;? extends B&gt;, B&gt;());<a name="line.46"></a>
<span class="sourceLineNo">047</span>  }<a name="line.47"></a>
<span class="sourceLineNo">048</span><a name="line.48"></a>
<span class="sourceLineNo">049</span>  /**<a name="line.49"></a>
<span class="sourceLineNo">050</span>   * Returns a new {@code MutableClassToInstanceMap} instance backed by a given<a name="line.50"></a>
<span class="sourceLineNo">051</span>   * empty {@code backingMap}. The caller surrenders control of the backing map,<a name="line.51"></a>
<span class="sourceLineNo">052</span>   * and thus should not allow any direct references to it to remain accessible.<a name="line.52"></a>
<span class="sourceLineNo">053</span>   */<a name="line.53"></a>
<span class="sourceLineNo">054</span>  public static &lt;B&gt; MutableClassToInstanceMap&lt;B&gt; create(<a name="line.54"></a>
<span class="sourceLineNo">055</span>      Map&lt;Class&lt;? extends B&gt;, B&gt; backingMap) {<a name="line.55"></a>
<span class="sourceLineNo">056</span>    return new MutableClassToInstanceMap&lt;B&gt;(backingMap);<a name="line.56"></a>
<span class="sourceLineNo">057</span>  }<a name="line.57"></a>
<span class="sourceLineNo">058</span><a name="line.58"></a>
<span class="sourceLineNo">059</span>  private MutableClassToInstanceMap(Map&lt;Class&lt;? extends B&gt;, B&gt; delegate) {<a name="line.59"></a>
<span class="sourceLineNo">060</span>    super(delegate, VALUE_CAN_BE_CAST_TO_KEY);<a name="line.60"></a>
<span class="sourceLineNo">061</span>  }<a name="line.61"></a>
<span class="sourceLineNo">062</span><a name="line.62"></a>
<span class="sourceLineNo">063</span>  private static final MapConstraint&lt;Class&lt;?&gt;, Object&gt; VALUE_CAN_BE_CAST_TO_KEY<a name="line.63"></a>
<span class="sourceLineNo">064</span>      = new MapConstraint&lt;Class&lt;?&gt;, Object&gt;() {<a name="line.64"></a>
<span class="sourceLineNo">065</span>    @Override<a name="line.65"></a>
<span class="sourceLineNo">066</span>    public void checkKeyValue(Class&lt;?&gt; key, Object value) {<a name="line.66"></a>
<span class="sourceLineNo">067</span>      cast(key, value);<a name="line.67"></a>
<span class="sourceLineNo">068</span>    }<a name="line.68"></a>
<span class="sourceLineNo">069</span>  };<a name="line.69"></a>
<span class="sourceLineNo">070</span><a name="line.70"></a>
<span class="sourceLineNo">071</span>  @Override<a name="line.71"></a>
<span class="sourceLineNo">072</span>  public &lt;T extends B&gt; T putInstance(Class&lt;T&gt; type, T value) {<a name="line.72"></a>
<span class="sourceLineNo">073</span>    return cast(type, put(type, value));<a name="line.73"></a>
<span class="sourceLineNo">074</span>  }<a name="line.74"></a>
<span class="sourceLineNo">075</span><a name="line.75"></a>
<span class="sourceLineNo">076</span>  @Override<a name="line.76"></a>
<span class="sourceLineNo">077</span>  public &lt;T extends B&gt; T getInstance(Class&lt;T&gt; type) {<a name="line.77"></a>
<span class="sourceLineNo">078</span>    return cast(type, get(type));<a name="line.78"></a>
<span class="sourceLineNo">079</span>  }<a name="line.79"></a>
<span class="sourceLineNo">080</span><a name="line.80"></a>
<span class="sourceLineNo">081</span>  private static &lt;B, T extends B&gt; T cast(Class&lt;T&gt; type, B value) {<a name="line.81"></a>
<span class="sourceLineNo">082</span>    return Primitives.wrap(type).cast(value);<a name="line.82"></a>
<span class="sourceLineNo">083</span>  }<a name="line.83"></a>
<span class="sourceLineNo">084</span><a name="line.84"></a>
<span class="sourceLineNo">085</span>  private static final long serialVersionUID = 0;<a name="line.85"></a>
<span class="sourceLineNo">086</span>}<a name="line.86"></a>




























































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